If you haven't heard of these they were the transmitter and receiver sites for KPH - the mighty Pacific coastal station that sent Morse code and RTTY to ships and point-to-point services until the late 1990s.
Both sites are now restored and they also run K6KPH - an amateur station. They were kind enough to let me operate some CW as well, letting me make contacts across the USA on 14MHz.
I shot a seven-minute video while I was there too - you can see us working G3LDI back in the UK on 20m CW. Go to https://www.youtube.com/watch?v=Wj-IwYPrtTM